Foxface being weird to new addition

Sherman

Membership Expired
I just added a 4-5" Yellow Tang. My Foxface is going up to the Yellow tang and it's like he's "sucking" on the Yellow Tang. The Foxface is smaller and not turning black or extending his spines.......
Is he trying to bite? What is he doing?
 
Sounds like Marc on a date.......

Could be a display or something along those lines. Unless they actually start tussling I wouldn't worry about it.
 
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